Title :
Ophthalmic A-scan ultrasonic measuring instrument based on MSP430
Author :
Chen, Juan ; Zhao, Xingqun
Author_Institution :
Dept. of Biomed. Eng., Southeast Univ., Nanjing, China
Abstract :
This paper schemed out an ophthalmic high frequency A-scan ultrasonic instrument to measure corneal thickness and ocular axial length, using pulse reflection principle and double counting method. A special ultrasonic high frequency transducer was designed to get higher resolution. In addition, differential circuit reduced the pulse width, thus improved the accuracy. From the results of comparative experiments with Orbscan II and general A-ultrasonic instrument, the device achieved its good goals.
Keywords :
biomedical measurement; biomedical transducers; biomedical ultrasonics; eye; ultrasonic transducers; MSP430; Orbscan II; corneal thickness; differential circuit; double counting method; ocular axial length; ophthalmic A-scan ultrasonic measuring instrument; pulse reflection principle; pulse width; ultrasonic high frequency transducer; Acoustics; Cornea; Probes; Thickness measurement; Transducers; Ultrasonic variables measurement; CPLD; MSP430 singlechip; corneal thickness; ocular axial length;
Conference_Titel :
Biomedical Engineering and Informatics (BMEI), 2010 3rd International Conference on
Conference_Location :
Yantai
Print_ISBN :
978-1-4244-6495-1
DOI :
10.1109/BMEI.2010.5639303
